单例模式 （招聘时最会考到的一种模式 ）⑧

 

public class SingletonTest
{
                       public static void mian(String[] args)
                    {
                       Singleton singleton = Singleton.getInstance();
                       Singleton singleton2 = Singleton.getInstance();
                       System.out.prinytln(singleton == singelton2);
                     }
}
class Singleton
{            

              private static Singleton singleton = new singleton();
              private Singleton()
             {
  
              } 

               public static Singleton getInstance()
             {
                  return singleton;
              } 
}

//在多线程中一般使用这种单例模式